Manual

1.18
Operation Manual
© 2016 Prism Media Products Ltd
Revision 1.01Prism Sound Callia
5 Callia software and firmware
Callia's software content comprises two separate parts. In the terminology of this manual, the
'firmware' is the part which resides, stored in flash memory, within the Callia unit itself and controls all
of the analogue, digital, conversion and DSP functionality at a low level. The 'software' resides on any
Windows PC or Mac which will stream audio to Callia.
Callia is a class-compliant USB Audio Device Class 2.0 (UAC2) device; as such, it will work with any
UAC2-compliant host. Mac hosts are natively UAC2-compliant, and so no driver software needs to
be installed under OS X for Callia to operate as a Core Audio device. Windows is not natively
UAC2-compliant, so Callia is supplied with a driver (part of the software install) which provides ASIO
and WDM audio connectivity under Windows. This driver is installed when the initial installation is
performed. Obviously no PC or Mac driver is needed for Callia to operate from an S/PDIF input.
Likewise, no driver is required for use with Linux hosts.
So, in summary, it is only necessary to install the software if you need to stream from a Windows PC.
However, the software install also contains an application to allow Callia's firmware to be updated
(flashed) from the PC or Mac in the case of new firmware becoming available. For that reason, it is
recommended that you always install the software on a PC or Mac, even if you will only stream audio
from a Mac or through the S/PDIF inputs. Note that no software application is currently available to
allow firmware to be updated from a Linux host.
5.1 Software and firmware updates
From time to time, new versions of the Windows or Mac software, or the Callia firmware itself, may
become available. To view the latest versions, please visit www.prismsound.com/callia.
Windows and Mac software updates can be installed by downloading the relevant files from the
website and following the procedures in the Installation procedures section.
Callia's firmware is updated by downloading the relevant firmware update package from the website
and unpacking it. If the Callia unit is re-powered whilst holding in the standby/source button, it enters
'bootloader' mode and prepares to receive new firmware from the PC or Mac. Running the firmware
downloader application (which must be installed on the connected PC or Mac - see Installation
procedures) causes a dialogue to pop up when the unit in bootloader mode is detected, inviting you to
download the unpacked .firmware file. Full instructions for updating the firmware are included with
the firmware download. Note that no software application is currently available to allow firmware to be
updated from a Linux host.